WO2018211886A1

WO2018211886A1 - Projection display device

Info

Publication number: WO2018211886A1
Application number: PCT/JP2018/015717
Authority: WO
Inventors: 貴士須藤
Original assignee: ソニー株式会社
Priority date: 2017-05-19
Filing date: 2018-04-16
Publication date: 2018-11-22
Also published as: EP3627221A1; US11156910B2; EP3627221B1; US20200201162A1; CN110622066A; EP3627221A4; JPWO2018211886A1

Abstract

The projection display device according to one embodiment of the present disclosure is provided with: a plurality of solid-state light sources; an image generating unit including a display element that modulates light outputted from the solid-state light sources; a light source optical system that guides, to the image generating unit, the light outputted from the solid-state light sources; and a projection optical system that projects image light generated by the image generating unit. The light source optical system has a first reflection element having a plurality of reflection regions and a plurality of light-transmitting regions, and the light-transmitting regions are arrayed in the direction substantially equal to the short axis direction of the elliptic cross-sectional shape of the light outputted from the solid-state light sources.

Description

Projection display

The present disclosure relates to a projection display device using, for example, a semiconductor laser as a light emitting element.

Projection-type display devices (projectors) that project a personal computer screen or video image onto a screen are required to have high brightness so that clear image light can be obtained even in a bright place. Therefore, in recent years, solid-state light-emitting elements such as light-emitting diodes (LEDs) and laser diodes (LDs) have been employed as light sources with high brightness in light source devices used in projection display devices.

As a method for improving the luminance of a projection display device that employs a solid light-emitting element as a light source, for example, in Patent Document 1, the long axis of emitted light having an elliptical cross section emitted from a laser diode is formed in a rectangular shape. A projection device is disclosed that is incident substantially parallel to the long side of the image forming surface of the display element. Thereby, in this projection apparatus, the intensity of the reflected light per unit area on the image forming surface of the display element is improved.

Japanese Patent Laying-Open No. 2015-121597

As described above, the projection display device is required to improve the luminance.

It is desirable to provide a projection display device that can improve luminance.

A projection display device according to an embodiment of the present disclosure includes a plurality of solid light sources, an image generation unit including a display element that modulates light emitted from the plurality of solid light sources, and light emitted from the plurality of solid light sources. A light source optical system that leads to an image generation unit, and a projection optical system that projects image light generated by the image generation unit. The light source optical system includes a plurality of reflection regions and a plurality of transmission regions. The plurality of transmission regions are arranged in substantially the same direction as the minor axis direction in the elliptical cross section of light emitted from the plurality of solid state light sources.

In the projection display device according to an embodiment of the present disclosure, a plurality of solid light sources and a light source optical system that guides light emitted from the plurality of solid light sources to the image generation unit include a plurality of reflection regions and a plurality of transmission regions. The first reflective element having the above is arranged. The first reflecting element is formed such that the arrangement direction of the plurality of transmission regions is substantially the same as the minor axis direction in the elliptical cross section of the light emitted from the plurality of solid light sources. This makes it possible to efficiently guide the light emitted from the plurality of solid light sources to the display element.

According to the projection display device of the embodiment of the present disclosure, in the light source optical system that guides the light emitted from the plurality of solid light sources to the image generation unit, the plurality of reflection regions and the plurality of transmission regions are provided as described above. And the plurality of reflective areas are arranged in the substantially same direction as the minor axis direction in the elliptical cross section of the light emitted from the plurality of solid light sources. The light emitted from the light is efficiently guided to the display element. Therefore, the luminance can be improved.

Note that the effect of the present disclosure is not necessarily limited to the effect described herein, and may be any effect described in the present specification.

It is a schematic diagram showing an example of a part of structure of the light source device and light source optical system which concern on one embodiment of this indication. It is a perspective view showing the structure of the semiconductor laser array which comprises the light source part shown in FIG. It is a schematic diagram showing the cross-sectional structure (A) and planar structure (B) of the light source part which comprises the light source device shown in FIG. FIG. 1 is a perspective view showing the structure of a reflecting mirror. It is a figure showing the positional relationship between the light radiate | emitted from the two light source parts shown in FIG. 1, and the reflective mirror shown in FIG. 4, and the light density after a synthesis | combination. It is a block diagram showing an example of composition of a projection type display concerning one embodiment of this indication. FIG. 7 is a schematic diagram illustrating an example of a partial configuration of the light source device and the light source optical system illustrated in FIG. 6. It is a schematic diagram showing an example of a part of structure of the light source device which concerns on the modification of this indication, and a light source optical system.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The following description is one specific example of the present disclosure, and the present disclosure is not limited to the following aspects. In addition, the present disclosure is not limited to the arrangement, dimensions, dimensional ratio, and the like of each component illustrated in each drawing. The order of explanation is as follows.
1. Embodiment (an example of a projection display device including a reflection mirror having a plurality of reflection regions and a plurality of transmission regions)
1-1. Configuration of light source device and light source optical system 1-2. Configuration of Projection Display 1-3 Action / Effect Modification (Example of arrangement of light source and reflection mirror)

<1. Embodiment>
FIG. 1 schematically illustrates an example of a partial configuration of a light source device (light source device 100) and a light source optical system (light source optical system 200) according to an embodiment of the present disclosure. These are used, for example, in a projection display device described later (for example, the projection display device 1, see FIG. 6). The projection display device 1 includes a light source device 100, a light source optical system 200, an image generation unit 300, and a projection optical system 400. In the present embodiment, the light source optical system 200 is a reflection mirror 212 (first reflection element) having a plurality of reflection regions 212X and a plurality of transmission regions 212Y as a reflection element that reflects light emitted from the light source device 100. ). The reflection mirror 212 has a configuration in which the plurality of transmission regions 212Y are arranged in substantially the same direction as the short axis direction in the elliptical cross section of the light emitted from the light source device 100.

(1-1. Configuration of Light Source Device and Light Source Optical System)
As shown in FIG. 1, the light source device 100 includes, for example, two light source units 110 (a light source unit 110a (second light source unit) and a light source unit 110b (first light source unit)). The light source unit 110a and the light source unit 110b are arranged in parallel and each have a plurality of light emitting elements (for example, a semiconductor laser 122 and a solid state light source). Specifically, each of the light source unit 110a and the light source unit 110b includes, for example, a plurality of semiconductor laser arrays 120.

FIG. 2 is a perspective view of the configuration of the semiconductor laser array 120. The semiconductor laser array 120 has a configuration in which a plurality of (here, 10) semiconductor lasers 122 are arranged in a pedestal part 121 in, for example, 5 rows and 2 columns. 3A schematically shows a cross-sectional configuration of the light source unit 110a and the light source unit 110b, and FIG. 3B schematically shows a planar configuration of the light source unit 110a and the light source unit 110b. Is. In the present embodiment, the light source unit 110a and the light source unit 110b have a configuration in which a plurality of (here, five) semiconductor laser arrays 120 illustrated in FIG. 2 are stacked in the column direction (Y-axis direction). The cross-sectional shape f of the laser light oscillated from the semiconductor laser 122 has an elliptical shape as shown in FIG. 5, for example. In the light source unit 110a and the light source unit 110b, the major axis and the minor axis of the laser beams Lx and Ly having an elliptical cross section oscillated from each semiconductor laser 122 are arranged in substantially the same direction.

The light source optical system 200 is for guiding light emitted from the light source device 100 (for example, laser light Lx, Ly) to the image generation unit, and is configured by a plurality of optical elements. The light source optical system 200 includes, as optical elements, a reflection mirror 211 (second reflection element) and a reflection mirror that are arranged in the oscillation direction of laser light (laser light Lx, Ly) emitted from the light source unit 110a and the light source unit 110b, respectively. 212 (first reflective element). The reflection mirror 211 and the reflection mirror 212 are configured by, for example, a plate-like member. The reflection mirror 211 and the reflection mirror 212 are respectively inclined with respect to the light source unit 110a and the light source unit 110b arranged in parallel, for example, at positions facing each other in the same direction. Thus, the laser beams Lx and Ly emitted from the semiconductor lasers 122 of the

light source units

110a and 110b are reflected in the same direction (in FIG. 1, the condensing lens 213 side).

The reflection mirror 211 and the reflection mirror 212 are configured by, for example, a metal film deposition mirror or a dielectric multilayer mirror.

In the present embodiment, of the two reflection mirrors 211 and 212, the reflection mirror 212 disposed near the condenser lens, that is, the light beam emitted from the light source unit 110a and reflected by the reflection mirror 211 on the optical path of the laser beam Lx. As described above, the reflection mirror 212 disposed in the configuration has a plurality of reflection regions 212X and a plurality of transmission regions 212Y. The reflective region 212X is a region that reflects light and bends the light in a direction substantially perpendicular to the incident direction, and the transmissive region 212Y is a region that transmits light.

The plurality of reflection areas 212X and the plurality of transmission areas 212Y are alternately arranged. The arrangement, for example, the arrangement direction of the plurality of transmission regions 212Y is preferably substantially the same as the minor axis direction in the elliptical cross section of the laser light emitted from the semiconductor laser 122. In addition, at least one of the plurality of reflection regions 212X and the plurality of transmission regions 212Y has a rectangular shape, for example, and the long side direction is the length of the elliptical cross section of the laser light emitted from the semiconductor laser 122. It is preferably formed so as to be substantially parallel to the axial direction. FIG. 4 is a perspective view of the configuration of the reflection mirror 212. The plurality of transmission regions 212Y of the reflection mirror 212 are configured by, for example, a plurality of openings 212h provided in a metal film deposition mirror or a dielectric multilayer mirror. Further, the plurality of transmission regions 212Y may be configured using, for example, a parallel plate-shaped transparent member. In that case, it is preferable to form an antireflection film on the surface of the transparent member.

FIG. 5 shows the positional relationship between the laser beams Lx and Ly emitted from the

light source units

110a and 110b, the plurality of reflection regions 212X and the plurality of transmission regions 212Y of the reflection mirror 212, and the combined light density. It is. The laser light Lx emitted from the light source unit 110a is reflected by the reflection mirror 211 as shown in FIG. A reflection mirror 212 is installed at the reflected end, and a transmission region 212Y is formed in each of the reflection mirrors 212 on the optical path of each laser beam Lx. Each laser beam Lx passes through the transmission region 212Y and enters the condenser lens 213. The laser light Ly emitted from the light source unit 110b is reflected by the reflection region 212X of the reflection mirror 212 and enters the condenser lens 213 together with the laser light Lx. At this time, the laser beam Lx and the laser beam Ly are incident on the condenser lens 213 independently without crossing each other. The laser beams Lx and Ly synthesized by the condenser lens 213 are alternately arranged as shown by the tip of the arrow in FIG. 5, and the light densities thereof are emitted from the light source unit 110a and the light source unit 110b, respectively. The optical density of the laser beam Lx and the laser beam Ly is doubled. That is, the luminance per unit area is doubled.

As described above, in order to efficiently improve the luminance per unit area, the reflection mirror 212 includes a plurality of transmission regions 212Y on the optical path of the laser light Lx reflected by the reflection mirror 211, and the light source unit 110b. It is desirable that the plurality of reflection regions 212X be disposed on the optical path of the laser beam Ly emitted from the laser beam Ly.

Further, the width (length in the short side direction) w of each transmission region 212Y is preferably not less than the length ls in the short axis direction of the laser beam Lx, for example, 1 s in consideration of a manufacturing margin or the like. It is desirable to set it as x1.5 or more. In addition, the depth (length in the long side direction) d of each transmission region 212Y is preferably set to a length lm or more in the long axis direction of the laser light Lx, for example, considering a manufacturing margin or the like. 1 s × 1.5 or more is desirable. The same applies to each reflection region 212X. As a result, the laser beams Lx and Ly can be combined without waste.

As described above, in the present embodiment, the light source unit 110a and the light source unit 110b arranged in parallel have been described above in the oscillation direction of the laser light Ly emitted from the light source unit 110 arranged near the condenser lens 213. By arranging the reflecting mirror 212 having the configuration, the laser beams Lx and Ly emitted from the light source unit 110a and the light source unit 110b are efficiently combined. Therefore, it is possible to improve the luminance in the projection display device 1 described later.

(1-2. Configuration of Projection Display Device)
As described above, the projection display device 1 according to the present embodiment includes the light source device 100, the light source optical system 200, the image generation unit 300, and the projection optical system 400 in this order. The projection display device 1 shown in FIG. 6 exemplifies a transmissive 3LCD (liquid crystal display) type projection display device that performs light modulation with a reflective liquid crystal panel (

liquid crystal panels

312R, 312G, 312B). However, it is not limited to this. For example, it may be configured as a reflection type 3LCD type projection display device that modulates light with a transmissive liquid crystal panel.

Note that the

liquid crystal panels

312R, 312G, and 312B correspond to a specific example of the display element of the present disclosure. The projection display device 1 of the present embodiment uses, for example, a digital micro-mirror device (DMD) instead of the reflective liquid crystal panel and the transmissive liquid crystal panel. It can also be applied to projectors.

The light source device 100 is provided with light sources that emit red light (R), green light (G), and blue light (B), which are necessary for color image display. In the present embodiment, the light source device 100 includes a light source device 100R that emits red light (R) and a light source device 100GB that emits green light (G) and blue light (B). In each of the light source devices 100R and 100GB, a solid light source such as a semiconductor laser (LD) or a light emitting diode (LED) that oscillates laser light having a corresponding wavelength is used as a light source.

FIG. 7 schematically shows a part of the configuration of the light source device 100GB that emits green light (G) and blue light (B) and the light source optical system 200 thereof. In general, the emission efficiency of the semiconductor laser 122G that emits green light (G) is lower than that of the semiconductor laser 122B that emits blue light (B). For this reason, as shown in FIG. 7, it is preferable that the green light (G) light source unit 110G is used by more semiconductor lasers 122G than the blue light (B) light source unit 110B, and the configuration of the light source unit 110G is In the same manner as the light source unit 110 shown in FIG. The blue light (B) light source unit 110B is configured by a light source unit 110Ba including, for example, three semiconductor laser arrays, as shown in FIG. 7, in accordance with the emission intensity obtained from the green light (G) light source unit 110G. Has been. Each light source part 110Ga, 110Gb, 110Ba is arranged in parallel toward this condensing lens 213, for example in this order.

Reflection mirrors 211G, 212G, and 212B are arranged in the oscillation directions of the laser beams Lga, Lgb, and Lb emitted from the light source units 110Ga, 110Gb, and 110Ba, respectively. The reflection mirror 211G is a general total reflection mirror, similar to the reflection mirror 211 described above. The reflection mirror 212G and the reflection mirror 212B have the same configuration as the reflection mirror 212 described above, and have a plurality of reflection regions and a plurality of transmission regions.

The installation positions of the reflecting

mirrors

211G, 212G, and 212B are gathered independently without the optical paths of the laser light Lga reflected by the reflecting mirror 211G and the laser beams Lgb and Lb reflected by the reflecting

mirrors

212G and 212B intersecting each other. It is adjusted so as to be incident on the optical lens 213. That is, the laser light Lgb emitted from the light source unit 110Gb is reflected in the plurality of reflection regions of the reflection mirror 212G. In the plurality of transmission regions of the reflection mirror 212G, the laser light Lga emitted from the light source unit 110Ga and reflected by the reflection mirror 211G is transmitted. The laser light Lb emitted from the light source unit 110Ba is reflected in the plurality of reflection regions of the reflection mirror 212B. In the plurality of transmission regions of the reflection mirror 212B, the laser light Lga reflected by the reflection mirror 211G and the laser light Lgb reflected by the plurality of reflection regions of the reflection mirror 212G are transmitted.

Note that the light source device 100R may have a general configuration, for example, the same configuration as the light source device 100 shown in FIG.

The light source optical system 200 includes a plurality of optical elements on the optical paths of light (red light (R), green light (G), and blue light (B)) emitted from the light source device 100R and the light source device 100GB. As an example, on the optical path of the light source device 100R, the reflection mirrors 211 and 212, the condenser lens 213, the diffusion plate 214, the collimator lens 215, the fly-

eye lenses

216 and 217, the condenser lens 218, Folding mirrors 219 and 220 are arranged. On the optical path of the light source device 100GB, for example, the reflection mirrors 211G, 212G, and 212B, the condenser lens 213, the diffusion plate 214, the collimator lens 215, the fly-

eye lenses

216 and 217, and the condenser lens 218 are provided. A folding mirror 219 and a dichroic mirror 221 are arranged.

Lights (red light (R), green light (G), and blue light (B)) emitted from the light source devices 100R and 100GB and passing through the reflection mirrors 211G and 212G (or the reflection mirrors 211G, 212G, and 212B) are respectively The light is condensed on the diffusion plate 214 by the condenser lens 213. The condensed red light (R), green light (G), and blue light (B) are diffused by the diffusion plate 214 and enter the collimator lens 215, respectively. The red light (R), green light (G), and blue light (B) transmitted through the collimator lens 215 are each divided into a plurality of constraints by the macro lens of the fly eye lens 216, and the corresponding macro lens in the fly eye lens 217. Each is imaged. Each of the microlenses of the fly-eye lens 217 functions as a secondary light source. The red light (R), green light (G), and blue light (B) that have passed through the fly-eye lens 217 are collected by the condenser lens 218, respectively.

On the optical path of the red light (R), folding mirrors 219 and 220 are arranged, and the red light (R) collected by the condenser lens 218 is sequentially reflected by the folding mirrors 219 and 220, and the polarization beam splitter ( PBS) 311R. On the optical path of green light (G) and blue light (B), a folding mirror 219 and a dichroic mirror 221 are arranged, and the green light (G) and blue light (B) collected by the condenser lens 218 are The light is reflected by the folding mirror 219 and enters the dichroic mirror 221, and is separated into green light (G) and blue light (B) by the dichroic mirror 221.

The image generation unit 300 includes

PBSs

311R, 311G, and 311B,

liquid crystal panels

312R, 312G, and 312B, and a dichroic prism 313.

The PBS 311R is disposed on the optical path of red light (R) and has a function of separating incident red light (R) into two polarization components orthogonal to each other on the polarization separation surface. The PBS 311G is disposed on the optical path of the green light (G) and has a function of separating the incident green light (G) into two polarization components orthogonal to each other on the polarization separation surface. The PBS 311B is disposed on the optical path of the blue light (B) and has a function of separating the incident blue light (B) into two polarization components orthogonal to each other on the polarization separation surface. Each polarization separation surface reflects one polarization component (for example, S polarization component) and transmits the other polarization component (for example, P polarization component).

The

liquid crystal panels

312R, 312G, and 312B are reflection type liquid crystal panels and generate image light of each color by modulating incident light based on an input image signal. The liquid crystal panel 312R is disposed on the optical path of red light (R) reflected on the polarization separation surface of the PBS 311R. The liquid crystal panel 312R is driven by, for example, a digital signal that is pulse-width modulated (PWM) according to a red image signal, thereby modulating incident light and reflecting the modulated light toward the PBS 311R. is doing. The liquid crystal panel 312G is disposed on the optical path of green light (G) reflected on the polarization separation surface of the PBS 311G. The liquid crystal panel 312G is driven by, for example, a digital signal pulse-width modulated (PWM) according to a green image signal, thereby modulating incident light and reflecting the modulated light toward the PBS 311G. is doing. The liquid crystal panel 312B is disposed on the optical path of the blue light B reflected on the polarization separation surface of the PBS 311B. The liquid crystal panel 312B is driven by, for example, a digital signal that is pulse width modulated (PWM) according to a blue image signal, thereby modulating incident light and reflecting the modulated light toward the PBS 311B. is doing.

Red light (R), green light (G), and blue light (B) reflected by the

liquid crystal panels

312R, 312G, and 312B are transmitted through the

PBSs

311R, 311G, and 311B, respectively, and enter the dichroic prism 313.

The dichroic prism 313 superimposes and combines the red light (R), green light (G), and blue light (B) incident from three directions, and directs the combined image light (Li) to the projection optical system 400. Exit.

The projection optical system 400 has a plurality of lenses, enlarges the image light (Li) synthesized by the dichroic prism 313, and projects it onto a screen (not shown).

(1-3. Action and effect)
As described above, the projection display device is required to have high brightness so that clear image light can be obtained even in a bright place. In recent years, solid-state light sources such as LEDs and LDs have been used as light sources for projection display devices. As a method for improving the brightness of a projection display device using a solid-state light source, for example, the long axis of emission light having an elliptical cross section emitted from an LD and the length of an image forming surface of a display element formed in a rectangle are used. It is considered that the side is substantially parallel. In this method, high brightness is achieved by improving the intensity of reflected light per unit area on the image forming surface of the display element.

Other methods may be to increase the number of solid light sources. However, for example, when the number of solid light sources is doubled and simply arranged on a flat surface, the size of the condensing lens and the distance between the condensing lens and the diffusion plate are doubled, resulting in an increase in the size of the light source device. There is a problem.

On the other hand, in the present embodiment, in the light source optical system 200 that guides the laser light emitted from the light source unit 110 having the plurality of semiconductor lasers 122 to the image generation unit 300, the plurality of reflection regions 212X and the plurality of transmission regions 212Y. The reflection mirror 212 having the above is arranged. The reflection mirror 212 is arranged such that the plurality of transmission regions 212Y are substantially the same as the minor axis direction in the elliptical cross section of the laser light emitted from the light source unit 110. As a result, the laser light L emitted from a plurality of solid state light sources can be efficiently guided to the image generation unit 300.

As described above, the projection display device 1 according to the present embodiment has the plurality of reflection regions 212X and the plurality of transmission regions 212Y as the optical elements constituting the light source optical system 200 as described above, and the plurality of transmission regions 212Y. However, the reflection mirror 212 arranged so as to be substantially the same as the short axis direction in the elliptical cross section of the laser light emitted from the light source unit 110 is arranged. As a result, the laser light L emitted from the light source unit 110 can be efficiently guided to the image generation unit 300, and the luminance can be improved.

Further, in the present embodiment, a plurality of light source units (for example, two of the light source unit 110a and the light source unit 110b) having a plurality of semiconductor lasers 122 and configured by a plurality of semiconductor laser arrays 120 are arranged in parallel. Of the light source unit 110a and the light source unit 110b arranged in parallel, the reflection mirror in the oscillation direction of the laser light Ly emitted from the light source unit 110b arranged near the display element (for example, the

liquid crystal panels

312R, 312G, 312B). 212 is arranged. Further, in the oscillation direction of the laser light Lx emitted from the light source unit 110a, for example, a reflection mirror 211 configured by a total reflection mirror is arranged. Thereby, the plurality of laser beams Lx emitted from the light source unit 110a and reflected by the reflection mirror 211 pass through the plurality of transmission regions 212Y of the reflection mirror 212, respectively. The plurality of laser beams Ly emitted from the light source unit 110b are reflected by the plurality of reflection regions 212X of the reflection mirror 212, and are incident on the condensing lens 213 and synthesized together with the plurality of laser beams Lx. Therefore, as described above, it is possible to improve luminance while suppressing an increase in the size of the light source device 100 as compared with a case where the number of semiconductor lasers is simply increased.

<2. Modification>
Next, a modification of the above embodiment will be described. In addition, the same code | symbol is attached | subjected to the component corresponding to the light source device 100 and the light source optical system 200 of the said embodiment, and description is abbreviate | omitted.

FIG. 8 schematically illustrates an example of a partial configuration of a light source device (light source device 500) and a light source optical system (light source optical system 600) according to a modification of the present disclosure. These are used for the projection display device (for example, the projection display device 1) as in the above embodiment. In this modification, for example, the light source unit 510a and the light source unit 510b having the same configuration are arranged at positions facing the light source unit 110a and the light source unit 110b, for example, with the broken line X passing through the center of the condenser lens 213 as the target axis. It is set. Further, a reflection mirror 511 and a reflection mirror 512 having the same configuration as that of the reflection mirror 211 and the reflection mirror 212 are arranged in the oscillation direction of the laser light L emitted from the light source unit 510a and the light source unit 510b, respectively. .

As described above, the light source device 100 is configured by arranging a plurality of light source units (here, four of the

light source units

110a, 110b, 510a, and 510b) and the reflecting

mirrors

211, 212, 511, and 512 of the present disclosure in line symmetry. The luminance can be further improved while suppressing the increase in size.

As described above, the present disclosure has been described with the embodiment and the modification. However, the present disclosure is not limited to the above-described embodiment and the like, and various modifications are possible.

Note that the effects described in the present specification are merely examples. The effects of the present disclosure are not limited to the effects described in this specification. The present disclosure may have effects other than those described in this specification.

For example, this indication can take the following composition.
(1)
A plurality of solid state light sources;
An image generation unit including a display element that modulates light emitted from the plurality of solid-state light sources;
A light source optical system that guides light emitted from the plurality of solid-state light sources to the image generation unit;
A projection optical system that projects the image light generated by the image generation unit,
The light source optical system includes a first reflective element having a plurality of reflection regions and a plurality of transmission regions,
The plurality of transmission regions are arranged in substantially the same direction as a minor axis direction in an elliptical cross section of light emitted from the plurality of solid state light sources.
(2)
The projection display device according to (1), wherein the first reflective element has the plurality of reflective regions and the plurality of transmissive regions arranged alternately.
(3)
The projection display device according to (1) or (2), wherein a longitudinal direction of the transmissive region is substantially the same as a major axis direction of an elliptical cross section of light emitted from the plurality of solid state light sources.
(4)
A first light source unit and a second light source unit each having the plurality of solid light sources;
The light source optical system has the first reflecting element in the light emitting direction from the first light source unit, and has the second reflecting element in the light emitting direction from the second light source unit, The projection display device according to any one of (1) to (3).
(5)
The projection display device according to (4), wherein the first light source unit and the second light source unit are arranged in parallel with respect to the display element in this order.
(6)
The first reflection element reflects light emitted from the first light source unit in the plurality of reflection regions, and is emitted from the second light source unit in the plurality of transmission regions, and the second reflection. The projection display device according to (4) or (5), wherein the light reflected by the element is transmitted.
(7)
The projection type according to any one of (1) to (6), wherein the first reflective element is configured by a mirror, and the plurality of transmission regions are configured by openings formed in the mirror. Display device.
(8)
The projection type according to any one of (4) and (6), wherein the projection type includes a third light source unit and a fourth light source unit facing the first light source unit and the second light source unit, respectively. Display device.
(9)
The light source optical system includes a third reflective element and a fourth reflective element, respectively, in the emission direction of light from the third light source unit and the fourth light source unit,
The third reflective element according to (8), wherein the third reflective element includes a plurality of reflective regions and a plurality of transmissive regions, and is alternately disposed.

This application claims priority on the basis of Japanese Patent Application No. 2017-099731 filed on May 19, 2017 at the Japan Patent Office. The entire contents of this application are hereby incorporated by reference. Incorporated into.

Those skilled in the art will envision various modifications, combinations, subcombinations, and changes, depending on design requirements and other factors, which are within the scope of the appended claims and their equivalents. It is understood that

Claims

A plurality of solid state light sources;
An image generation unit including a display element that modulates light emitted from the plurality of solid-state light sources;
A light source optical system that guides light emitted from the plurality of solid-state light sources to the image generation unit;
A projection optical system that projects the image light generated by the image generation unit,
The light source optical system includes a first reflective element having a plurality of reflection regions and a plurality of transmission regions,
The plurality of transmission regions are arranged in substantially the same direction as a minor axis direction in an elliptical cross section of light emitted from the plurality of solid state light sources.
The projection display device according to claim 1, wherein the first reflective element has the plurality of reflective regions and the plurality of transmissive regions arranged alternately.
2. The projection display device according to claim 1, wherein a longitudinal direction of the transmissive region and a major axis direction of an elliptical cross section of light emitted from the plurality of solid light sources are substantially the same.
A first light source unit and a second light source unit each having the plurality of solid light sources;
The light source optical system has the first reflecting element in the light emitting direction from the first light source unit, and has the second reflecting element in the light emitting direction from the second light source unit, The projection display device according to claim 1.
The projection type display device according to claim 4, wherein the first light source unit and the second light source unit are arranged in parallel in this order with respect to the display element.
The first reflection element reflects light emitted from the first light source unit in the plurality of reflection regions, and is emitted from the second light source unit in the plurality of transmission regions, and the second reflection. The projection display device according to claim 4, wherein the light reflected by the element is transmitted.
The projection display device according to claim 1, wherein the first reflective element is configured by a mirror, and the plurality of transmission regions are configured by openings formed in the mirror.
The projection display device according to claim 4, further comprising a third light source unit and a fourth light source unit facing the first light source unit and the second light source unit, respectively.
The light source optical system includes a third reflective element and a fourth reflective element, respectively, in the emission direction of light from the third light source unit and the fourth light source unit,
The projection display device according to claim 8, wherein the third reflection element has a plurality of reflection regions and a plurality of transmission regions, and is alternately arranged.